Is there Any App to By Reliance or any Similar Gift card on discount.

[Phonix_YT]

Usually I buy amazon vouchers using millennia credit card from amazon them buy the Reliance GV using amazon Gv but the problem is , that i can only get 1k cashback per month so is there any other app where i can buy Reliance smart gv with discount.
PS : Amazon provides 3% additional discount.

Or does HDFC swiggy/ SBI Cashback card will provide me double dip on Magicpin or similar app.